A.By controlling the temperature
B.By putting food in a refrigerator
C.By controlling the growth of bacteria
D.By putting food in a place without air
第1题
ed.
A.was doing
B.does
C.have done
D.had done
第5题
From the passage we can guess how old was the girl?
A.5.
B.12.
C.16
D.20
第9题
How can we best_______ our limited resources?
A、employ
B、utilize
C、enforce
D、enlarge
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